package com.nowcoder.community.entity;
//封装 分页的相关信息
public class Page {
    // 当前页码
    private int current = 1;
    //显示的上限
    private int limit = 10;
    //数据总数(用于计算总的页数)
    private int rows;
    //查询路径(用于分页链接)
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current >= 1) this.current = current;
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >=1 && limit <= 100) this.limit = limit;
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows >= 0) this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
    //获取当前页的起始行
    public int getOffset(){
        return (current-1) * limit;
    }
    //获取总页数
    public int getTotal(){
        // rows / limit
        if(rows % limit == 0) return rows / limit;
        else return rows / limit + 1;
    }
    //获取起始页码
    public int getFrom(){
        int from = current - 2;
        return from < 1 ? 1 : from;
    }
    //获取结束页码
    public int getTo(){
        int to = current + 2;
        int total = getTotal();
        return to > total ? total : to;
    }
    @Override
    public String toString() {
        return "Page{" +
                "current=" + current +
                ", limit=" + limit +
                ", rows=" + rows +
                ", path='" + path + '\'' +
                '}';
    }
}
